That segment is about cocoa. Here is the study in question:High cocoa polyphenol rich chocolate may reduce the burden of the symptoms in chronic fatigue syndrome
Results: Ten subjects were enrolled in the study. The Chalder Fatigue Scale score improved significantly after 8 weeks of the HCL/PR chocolate arm [median (range) Exact Sig. (2-tailed)] [33 (25 - 38) vs. 21.5 (6 - 35) 0.01], but that deteriorated significantly when subjects were given simulated iso-calorific chocolate (CLF/CP) [ 28.5 (17 - 20) vs. 34.5 (13-26) 0.03]. The residual function, as assessed by the London Handicap scale, also improved significantly after the HCL/PR arm [0.49 (0.33 - 0.62) vs. 0.64 (0.44 - 0.83) 0.01] and deteriorated after iso-calorific chocolate [00.44 (0.43 - 0.68) vs. 0.36 (0.33 - 0.62)0.03]. Likewise the Hospital Anxiety and Depression score also improved after the HCL/PR arm, but deteriorated after CLF/CP. Mean weight remained unchanged throughout the trial.
Conclusion: This study suggests that HCL/PR chocolate may improve symptoms in subjects with chronic fatigue syndrome.
Dr. Greger said that it would take 2,5 tablespoons of cocoa powder a day to get the same amount than what was used in the study. He also suggested that one could add the cocoa to coffee or blend it with some berries.